1 /**************************************************************************
3 * Copyright 2009 VMware, Inc.
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 **************************************************************************/
30 * Texture sampling -- SoA.
32 * @author Jose Fonseca <jfonseca@vmware.com>
35 #include "pipe/p_defines.h"
36 #include "pipe/p_state.h"
37 #include "util/u_debug.h"
38 #include "util/u_dump.h"
39 #include "util/u_memory.h"
40 #include "util/u_math.h"
41 #include "util/u_format.h"
42 #include "util/u_cpu_detect.h"
43 #include "lp_bld_debug.h"
44 #include "lp_bld_type.h"
45 #include "lp_bld_const.h"
46 #include "lp_bld_conv.h"
47 #include "lp_bld_arit.h"
48 #include "lp_bld_logic.h"
49 #include "lp_bld_swizzle.h"
50 #include "lp_bld_pack.h"
51 #include "lp_bld_format.h"
52 #include "lp_bld_sample.h"
56 * Keep all information for sampling code generation in a single place.
58 struct lp_build_sample_context
60 LLVMBuilderRef builder
;
62 const struct lp_sampler_static_state
*static_state
;
64 struct lp_sampler_dynamic_state
*dynamic_state
;
66 const struct util_format_description
*format_desc
;
68 /** Incoming coordinates type and build context */
69 struct lp_type coord_type
;
70 struct lp_build_context coord_bld
;
72 /** Unsigned integer coordinates */
73 struct lp_type uint_coord_type
;
74 struct lp_build_context uint_coord_bld
;
76 /** Signed integer coordinates */
77 struct lp_type int_coord_type
;
78 struct lp_build_context int_coord_bld
;
80 /** Output texels type and build context */
81 struct lp_type texel_type
;
82 struct lp_build_context texel_bld
;
87 * Does the given texture wrap mode allow sampling the texture border color?
88 * XXX maybe move this into gallium util code.
91 wrap_mode_uses_border_color(unsigned mode
)
94 case PIPE_TEX_WRAP_REPEAT
:
95 case PIPE_TEX_WRAP_CLAMP_TO_EDGE
:
96 case PIPE_TEX_WRAP_MIRROR_REPEAT
:
97 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE
:
99 case PIPE_TEX_WRAP_CLAMP
:
100 case PIPE_TEX_WRAP_CLAMP_TO_BORDER
:
101 case PIPE_TEX_WRAP_MIRROR_CLAMP
:
102 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER
:
105 assert(0 && "unexpected wrap mode");
113 * Gen code to fetch a texel from a texture at int coords (x, y).
114 * The result, texel, will be:
115 * texel[0] = red values
116 * texel[1] = green values
117 * texel[2] = blue values
118 * texel[3] = alpha values
121 lp_build_sample_texel_soa(struct lp_build_sample_context
*bld
,
126 LLVMValueRef y_stride
,
127 LLVMValueRef data_ptr
,
130 struct lp_build_context
*int_coord_bld
= &bld
->int_coord_bld
;
133 LLVMValueRef use_border
= NULL
;
135 /* use_border = x < 0 || x >= width || y < 0 || y >= height */
136 if (wrap_mode_uses_border_color(bld
->static_state
->wrap_s
)) {
138 b1
= lp_build_cmp(int_coord_bld
, PIPE_FUNC_LESS
, x
, int_coord_bld
->zero
);
139 b2
= lp_build_cmp(int_coord_bld
, PIPE_FUNC_GEQUAL
, x
, width
);
140 use_border
= LLVMBuildOr(bld
->builder
, b1
, b2
, "b1_or_b2");
143 if (wrap_mode_uses_border_color(bld
->static_state
->wrap_t
)) {
145 b1
= lp_build_cmp(int_coord_bld
, PIPE_FUNC_LESS
, y
, int_coord_bld
->zero
);
146 b2
= lp_build_cmp(int_coord_bld
, PIPE_FUNC_GEQUAL
, y
, height
);
148 use_border
= LLVMBuildOr(bld
->builder
, use_border
, b1
, "ub_or_b1");
149 use_border
= LLVMBuildOr(bld
->builder
, use_border
, b2
, "ub_or_b2");
152 use_border
= LLVMBuildOr(bld
->builder
, b1
, b2
, "b1_or_b2");
157 * Note: if we find an app which frequently samples the texture border
158 * we might want to implement a true conditional here to avoid sampling
159 * the texture whenever possible (since that's quite a bit of code).
162 * texel = border_color;
165 * texel = sample_texture(coord);
167 * As it is now, we always sample the texture, then selectively replace
168 * the texel color results with the border color.
171 /* convert x,y coords to linear offset from start of texture, in bytes */
172 offset
= lp_build_sample_offset(&bld
->uint_coord_bld
,
177 assert(bld
->format_desc
->block
.width
== 1);
178 assert(bld
->format_desc
->block
.height
== 1);
179 assert(bld
->format_desc
->block
.bits
<= bld
->texel_type
.width
);
181 /* gather the texels from the texture */
182 packed
= lp_build_gather(bld
->builder
,
183 bld
->texel_type
.length
,
184 bld
->format_desc
->block
.bits
,
185 bld
->texel_type
.width
,
188 /* convert texels to float rgba */
189 lp_build_unpack_rgba_soa(bld
->builder
,
195 /* select texel color or border color depending on use_border */
197 for (chan
= 0; chan
< 4; chan
++) {
198 LLVMValueRef border_chan
=
199 lp_build_const_scalar(bld
->texel_type
,
200 bld
->static_state
->border_color
[chan
]);
201 texel
[chan
] = lp_build_select(&bld
->texel_bld
, use_border
,
202 border_chan
, texel
[chan
]);
209 lp_build_sample_packed(struct lp_build_sample_context
*bld
,
212 LLVMValueRef y_stride
,
213 LLVMValueRef data_ptr
)
217 offset
= lp_build_sample_offset(&bld
->uint_coord_bld
,
222 assert(bld
->format_desc
->block
.width
== 1);
223 assert(bld
->format_desc
->block
.height
== 1);
224 assert(bld
->format_desc
->block
.bits
<= bld
->texel_type
.width
);
226 return lp_build_gather(bld
->builder
,
227 bld
->texel_type
.length
,
228 bld
->format_desc
->block
.bits
,
229 bld
->texel_type
.width
,
235 * Helper to compute the mirror function for the PIPE_WRAP_MIRROR modes.
238 lp_build_coord_mirror(struct lp_build_sample_context
*bld
,
241 struct lp_build_context
*coord_bld
= &bld
->coord_bld
;
242 struct lp_build_context
*int_coord_bld
= &bld
->int_coord_bld
;
243 LLVMValueRef fract
, flr
, isOdd
;
245 /* fract = coord - floor(coord) */
246 fract
= lp_build_sub(coord_bld
, coord
, lp_build_floor(coord_bld
, coord
));
248 /* flr = ifloor(coord); */
249 flr
= lp_build_ifloor(coord_bld
, coord
);
251 /* isOdd = flr & 1 */
252 isOdd
= LLVMBuildAnd(bld
->builder
, flr
, int_coord_bld
->one
, "");
254 /* make coord positive or negative depending on isOdd */
255 coord
= lp_build_set_sign(coord_bld
, fract
, isOdd
);
257 /* convert isOdd to float */
258 isOdd
= lp_build_int_to_float(coord_bld
, isOdd
);
260 /* add isOdd to coord */
261 coord
= lp_build_add(coord_bld
, coord
, isOdd
);
268 * We only support a few wrap modes in lp_build_sample_wrap_int() at this time.
269 * Return whether the given mode is supported by that function.
272 is_simple_wrap_mode(unsigned mode
)
275 case PIPE_TEX_WRAP_REPEAT
:
276 case PIPE_TEX_WRAP_CLAMP
:
277 case PIPE_TEX_WRAP_CLAMP_TO_EDGE
:
279 case PIPE_TEX_WRAP_CLAMP_TO_BORDER
:
287 * Build LLVM code for texture wrap mode, for scaled integer texcoords.
288 * \param coord the incoming texcoord (s,t,r or q) scaled to the texture size
289 * \param length the texture size along one dimension
290 * \param is_pot if TRUE, length is a power of two
291 * \param wrap_mode one of PIPE_TEX_WRAP_x
294 lp_build_sample_wrap_int(struct lp_build_sample_context
*bld
,
300 struct lp_build_context
*uint_coord_bld
= &bld
->uint_coord_bld
;
301 struct lp_build_context
*int_coord_bld
= &bld
->int_coord_bld
;
302 LLVMValueRef length_minus_one
;
304 length_minus_one
= lp_build_sub(uint_coord_bld
, length
, uint_coord_bld
->one
);
307 case PIPE_TEX_WRAP_REPEAT
:
309 coord
= LLVMBuildAnd(bld
->builder
, coord
, length_minus_one
, "");
311 /* Signed remainder won't give the right results for negative
312 * dividends but unsigned remainder does.*/
313 coord
= LLVMBuildURem(bld
->builder
, coord
, length
, "");
316 case PIPE_TEX_WRAP_CLAMP
:
317 case PIPE_TEX_WRAP_CLAMP_TO_EDGE
:
318 case PIPE_TEX_WRAP_CLAMP_TO_BORDER
:
319 coord
= lp_build_max(int_coord_bld
, coord
, int_coord_bld
->zero
);
320 coord
= lp_build_min(int_coord_bld
, coord
, length_minus_one
);
323 case PIPE_TEX_WRAP_MIRROR_REPEAT
:
324 case PIPE_TEX_WRAP_MIRROR_CLAMP
:
325 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE
:
326 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER
:
328 _debug_printf("llvmpipe: failed to translate texture wrap mode %s\n",
329 util_dump_tex_wrap(wrap_mode
, TRUE
));
330 coord
= lp_build_max(uint_coord_bld
, coord
, uint_coord_bld
->zero
);
331 coord
= lp_build_min(uint_coord_bld
, coord
, length_minus_one
);
343 * Build LLVM code for texture wrap mode for linear filtering.
344 * \param x0_out returns first integer texcoord
345 * \param x1_out returns second integer texcoord
346 * \param weight_out returns linear interpolation weight
349 lp_build_sample_wrap_linear(struct lp_build_sample_context
*bld
,
354 LLVMValueRef
*x0_out
,
355 LLVMValueRef
*x1_out
,
356 LLVMValueRef
*weight_out
)
358 struct lp_build_context
*coord_bld
= &bld
->coord_bld
;
359 struct lp_build_context
*int_coord_bld
= &bld
->int_coord_bld
;
360 struct lp_build_context
*uint_coord_bld
= &bld
->uint_coord_bld
;
361 LLVMValueRef two
= lp_build_const_scalar(coord_bld
->type
, 2.0);
362 LLVMValueRef half
= lp_build_const_scalar(coord_bld
->type
, 0.5);
363 LLVMValueRef length_f
= lp_build_int_to_float(coord_bld
, length
);
364 LLVMValueRef length_minus_one
= lp_build_sub(uint_coord_bld
, length
, uint_coord_bld
->one
);
365 LLVMValueRef length_f_minus_one
= lp_build_sub(coord_bld
, length_f
, coord_bld
->one
);
366 LLVMValueRef coord0
, coord1
, weight
;
369 case PIPE_TEX_WRAP_REPEAT
:
370 /* mul by size and subtract 0.5 */
371 coord
= lp_build_mul(coord_bld
, coord
, length_f
);
372 coord
= lp_build_sub(coord_bld
, coord
, half
);
374 coord0
= lp_build_ifloor(coord_bld
, coord
);
375 coord1
= lp_build_add(uint_coord_bld
, coord0
, uint_coord_bld
->one
);
376 /* compute lerp weight */
377 weight
= lp_build_fract(coord_bld
, coord
);
380 coord0
= LLVMBuildAnd(bld
->builder
, coord0
, length_minus_one
, "");
381 coord1
= LLVMBuildAnd(bld
->builder
, coord1
, length_minus_one
, "");
384 /* Signed remainder won't give the right results for negative
385 * dividends but unsigned remainder does.*/
386 coord0
= LLVMBuildURem(bld
->builder
, coord0
, length
, "");
387 coord1
= LLVMBuildURem(bld
->builder
, coord1
, length
, "");
391 case PIPE_TEX_WRAP_CLAMP
:
392 if (bld
->static_state
->normalized_coords
) {
393 coord
= lp_build_mul(coord_bld
, coord
, length_f
);
395 weight
= lp_build_fract(coord_bld
, coord
);
396 coord0
= lp_build_clamp(coord_bld
, coord
, coord_bld
->zero
,
398 coord1
= lp_build_add(coord_bld
, coord
, coord_bld
->one
);
399 coord1
= lp_build_clamp(coord_bld
, coord1
, coord_bld
->zero
,
401 coord0
= lp_build_ifloor(coord_bld
, coord0
);
402 coord1
= lp_build_ifloor(coord_bld
, coord1
);
405 case PIPE_TEX_WRAP_CLAMP_TO_EDGE
:
406 if (bld
->static_state
->normalized_coords
) {
408 coord
= lp_build_clamp(coord_bld
, coord
, coord_bld
->zero
, coord_bld
->one
);
409 /* mul by tex size and subtract 0.5 */
410 coord
= lp_build_mul(coord_bld
, coord
, length_f
);
411 coord
= lp_build_sub(coord_bld
, coord
, half
);
414 LLVMValueRef min
, max
;
415 /* clamp to [0.5, length - 0.5] */
416 min
= lp_build_const_scalar(coord_bld
->type
, 0.5F
);
417 max
= lp_build_sub(coord_bld
, length_f
, min
);
418 coord
= lp_build_clamp(coord_bld
, coord
, min
, max
);
420 /* compute lerp weight */
421 weight
= lp_build_fract(coord_bld
, coord
);
422 /* coord0 = floor(coord); */
423 coord0
= lp_build_ifloor(coord_bld
, coord
);
424 coord1
= lp_build_add(int_coord_bld
, coord0
, int_coord_bld
->one
);
425 /* coord0 = max(coord0, 0) */
426 coord0
= lp_build_max(int_coord_bld
, coord0
, int_coord_bld
->zero
);
427 /* coord1 = min(coord1, length-1) */
428 coord1
= lp_build_min(int_coord_bld
, coord1
, length_minus_one
);
431 case PIPE_TEX_WRAP_CLAMP_TO_BORDER
:
433 LLVMValueRef min
, max
;
434 if (bld
->static_state
->normalized_coords
) {
435 /* min = -1.0 / (2 * length) = -0.5 / length */
436 min
= lp_build_mul(coord_bld
,
437 lp_build_const_scalar(coord_bld
->type
, -0.5F
),
438 lp_build_rcp(coord_bld
, length_f
));
439 /* max = 1.0 - min */
440 max
= lp_build_sub(coord_bld
, coord_bld
->one
, min
);
441 /* coord = clamp(coord, min, max) */
442 coord
= lp_build_clamp(coord_bld
, coord
, min
, max
);
443 /* scale coord to length (and sub 0.5?) */
444 coord
= lp_build_mul(coord_bld
, coord
, length_f
);
445 coord
= lp_build_sub(coord_bld
, coord
, half
);
448 /* clamp to [-0.5, length + 0.5] */
449 min
= lp_build_const_scalar(coord_bld
->type
, -0.5F
);
450 max
= lp_build_sub(coord_bld
, length_f
, min
);
451 coord
= lp_build_clamp(coord_bld
, coord
, min
, max
);
452 coord
= lp_build_sub(coord_bld
, coord
, half
);
454 /* compute lerp weight */
455 weight
= lp_build_fract(coord_bld
, coord
);
457 coord0
= lp_build_ifloor(coord_bld
, coord
);
458 coord1
= lp_build_add(int_coord_bld
, coord0
, int_coord_bld
->one
);
462 case PIPE_TEX_WRAP_MIRROR_REPEAT
:
463 /* compute mirror function */
464 coord
= lp_build_coord_mirror(bld
, coord
);
466 /* scale coord to length */
467 coord
= lp_build_mul(coord_bld
, coord
, length_f
);
468 coord
= lp_build_sub(coord_bld
, coord
, half
);
470 /* compute lerp weight */
471 weight
= lp_build_fract(coord_bld
, coord
);
473 /* convert to int coords */
474 coord0
= lp_build_ifloor(coord_bld
, coord
);
475 coord1
= lp_build_add(int_coord_bld
, coord0
, int_coord_bld
->one
);
477 /* coord0 = max(coord0, 0) */
478 coord0
= lp_build_max(int_coord_bld
, coord0
, int_coord_bld
->zero
);
479 /* coord1 = min(coord1, length-1) */
480 coord1
= lp_build_min(int_coord_bld
, coord1
, length_minus_one
);
483 case PIPE_TEX_WRAP_MIRROR_CLAMP
:
485 LLVMValueRef min
, max
;
486 /* min = 1.0 / (2 * length) */
487 min
= lp_build_rcp(coord_bld
, lp_build_mul(coord_bld
, two
, length_f
));
488 /* max = 1.0 - min */
489 max
= lp_build_sub(coord_bld
, coord_bld
->one
, min
);
491 coord
= lp_build_abs(coord_bld
, coord
);
492 coord
= lp_build_clamp(coord_bld
, coord
, min
, max
);
493 coord
= lp_build_mul(coord_bld
, coord
, length_f
);
494 if(0)coord
= lp_build_sub(coord_bld
, coord
, half
);
495 weight
= lp_build_fract(coord_bld
, coord
);
496 coord0
= lp_build_ifloor(coord_bld
, coord
);
497 coord1
= lp_build_add(int_coord_bld
, coord0
, int_coord_bld
->one
);
501 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE
:
503 LLVMValueRef min
, max
;
504 /* min = 1.0 / (2 * length) */
505 min
= lp_build_rcp(coord_bld
, lp_build_mul(coord_bld
, two
, length_f
));
506 /* max = 1.0 - min */
507 max
= lp_build_sub(coord_bld
, coord_bld
->one
, min
);
509 coord
= lp_build_abs(coord_bld
, coord
);
510 coord
= lp_build_clamp(coord_bld
, coord
, min
, max
);
511 coord
= lp_build_mul(coord_bld
, coord
, length_f
);
512 coord
= lp_build_sub(coord_bld
, coord
, half
);
513 weight
= lp_build_fract(coord_bld
, coord
);
514 coord0
= lp_build_ifloor(coord_bld
, coord
);
515 coord1
= lp_build_add(int_coord_bld
, coord0
, int_coord_bld
->one
);
519 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER
:
521 LLVMValueRef min
, max
;
522 /* min = -1.0 / (2 * length) = -0.5 / length */
523 min
= lp_build_mul(coord_bld
,
524 lp_build_const_scalar(coord_bld
->type
, -0.5F
),
525 lp_build_rcp(coord_bld
, length_f
));
526 /* max = 1.0 - min */
527 max
= lp_build_sub(coord_bld
, coord_bld
->one
, min
);
529 coord
= lp_build_abs(coord_bld
, coord
);
530 coord
= lp_build_clamp(coord_bld
, coord
, min
, max
);
531 coord
= lp_build_mul(coord_bld
, coord
, length_f
);
532 coord
= lp_build_sub(coord_bld
, coord
, half
);
533 weight
= lp_build_fract(coord_bld
, coord
);
534 coord0
= lp_build_ifloor(coord_bld
, coord
);
535 coord1
= lp_build_add(int_coord_bld
, coord0
, int_coord_bld
->one
);
545 *weight_out
= weight
;
550 * Build LLVM code for texture wrap mode for nearest filtering.
551 * \param coord the incoming texcoord (nominally in [0,1])
552 * \param length the texture size along one dimension, as int
553 * \param is_pot if TRUE, length is a power of two
554 * \param wrap_mode one of PIPE_TEX_WRAP_x
557 lp_build_sample_wrap_nearest(struct lp_build_sample_context
*bld
,
563 struct lp_build_context
*coord_bld
= &bld
->coord_bld
;
564 struct lp_build_context
*int_coord_bld
= &bld
->int_coord_bld
;
565 struct lp_build_context
*uint_coord_bld
= &bld
->uint_coord_bld
;
566 LLVMValueRef two
= lp_build_const_scalar(coord_bld
->type
, 2.0);
567 LLVMValueRef length_f
= lp_build_int_to_float(coord_bld
, length
);
568 LLVMValueRef length_minus_one
= lp_build_sub(uint_coord_bld
, length
, uint_coord_bld
->one
);
569 LLVMValueRef length_f_minus_one
= lp_build_sub(coord_bld
, length_f
, coord_bld
->one
);
573 case PIPE_TEX_WRAP_REPEAT
:
574 coord
= lp_build_mul(coord_bld
, coord
, length_f
);
575 icoord
= lp_build_ifloor(coord_bld
, coord
);
577 icoord
= LLVMBuildAnd(bld
->builder
, icoord
, length_minus_one
, "");
579 /* Signed remainder won't give the right results for negative
580 * dividends but unsigned remainder does.*/
581 icoord
= LLVMBuildURem(bld
->builder
, icoord
, length
, "");
584 case PIPE_TEX_WRAP_CLAMP
:
586 if (bld
->static_state
->normalized_coords
) {
587 coord
= lp_build_mul(coord_bld
, coord
, length_f
);
590 icoord
= lp_build_ifloor(coord_bld
, coord
);
591 /* clamp to [0, size-1]. Note: int coord builder type */
592 icoord
= lp_build_clamp(int_coord_bld
, icoord
, int_coord_bld
->zero
,
596 case PIPE_TEX_WRAP_CLAMP_TO_EDGE
:
598 LLVMValueRef min
, max
;
599 if (bld
->static_state
->normalized_coords
) {
600 /* min = 1.0 / (2 * length) */
601 min
= lp_build_rcp(coord_bld
, lp_build_mul(coord_bld
, two
, length_f
));
602 /* max = length - min */
603 max
= lp_build_sub(coord_bld
, length_f
, min
);
604 /* scale coord to length */
605 coord
= lp_build_mul(coord_bld
, coord
, length_f
);
608 /* clamp to [0.5, length - 0.5] */
609 min
= lp_build_const_scalar(coord_bld
->type
, 0.5F
);
610 max
= lp_build_sub(coord_bld
, length_f
, min
);
612 /* coord = clamp(coord, min, max) */
613 coord
= lp_build_clamp(coord_bld
, coord
, min
, max
);
614 icoord
= lp_build_ifloor(coord_bld
, coord
);
618 case PIPE_TEX_WRAP_CLAMP_TO_BORDER
:
619 /* Note: this is the same as CLAMP_TO_EDGE, except min = -min */
621 LLVMValueRef min
, max
;
622 if (bld
->static_state
->normalized_coords
) {
623 /* min = -1.0 / (2 * length) = -0.5 / length */
624 min
= lp_build_mul(coord_bld
,
625 lp_build_const_scalar(coord_bld
->type
, -0.5F
),
626 lp_build_rcp(coord_bld
, length_f
));
627 /* max = length - min */
628 max
= lp_build_sub(coord_bld
, length_f
, min
);
629 /* scale coord to length */
630 coord
= lp_build_mul(coord_bld
, coord
, length_f
);
633 /* clamp to [-0.5, length + 0.5] */
634 min
= lp_build_const_scalar(coord_bld
->type
, -0.5F
);
635 max
= lp_build_sub(coord_bld
, length_f
, min
);
637 /* coord = clamp(coord, min, max) */
638 coord
= lp_build_clamp(coord_bld
, coord
, min
, max
);
639 icoord
= lp_build_ifloor(coord_bld
, coord
);
643 case PIPE_TEX_WRAP_MIRROR_REPEAT
:
645 LLVMValueRef min
, max
;
646 /* min = 1.0 / (2 * length) */
647 min
= lp_build_rcp(coord_bld
, lp_build_mul(coord_bld
, two
, length_f
));
648 /* max = length - min */
649 max
= lp_build_sub(coord_bld
, length_f
, min
);
651 /* compute mirror function */
652 coord
= lp_build_coord_mirror(bld
, coord
);
654 /* scale coord to length */
655 coord
= lp_build_mul(coord_bld
, coord
, length_f
);
657 /* coord = clamp(coord, min, max) */
658 coord
= lp_build_clamp(coord_bld
, coord
, min
, max
);
659 icoord
= lp_build_ifloor(coord_bld
, coord
);
663 case PIPE_TEX_WRAP_MIRROR_CLAMP
:
664 coord
= lp_build_abs(coord_bld
, coord
);
665 coord
= lp_build_mul(coord_bld
, coord
, length_f
);
666 coord
= lp_build_clamp(coord_bld
, coord
, coord_bld
->zero
, length_f_minus_one
);
667 icoord
= lp_build_ifloor(coord_bld
, coord
);
670 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE
:
672 LLVMValueRef min
, max
;
673 /* min = 1.0 / (2 * length) */
674 min
= lp_build_rcp(coord_bld
, lp_build_mul(coord_bld
, two
, length_f
));
675 /* max = length - min */
676 max
= lp_build_sub(coord_bld
, length_f
, min
);
678 coord
= lp_build_abs(coord_bld
, coord
);
679 coord
= lp_build_mul(coord_bld
, coord
, length_f
);
680 coord
= lp_build_clamp(coord_bld
, coord
, min
, max
);
681 icoord
= lp_build_ifloor(coord_bld
, coord
);
685 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER
:
687 LLVMValueRef min
, max
;
688 /* min = 1.0 / (2 * length) */
689 min
= lp_build_rcp(coord_bld
, lp_build_mul(coord_bld
, two
, length_f
));
690 min
= lp_build_negate(coord_bld
, min
);
691 /* max = length - min */
692 max
= lp_build_sub(coord_bld
, length_f
, min
);
694 coord
= lp_build_abs(coord_bld
, coord
);
695 coord
= lp_build_mul(coord_bld
, coord
, length_f
);
696 coord
= lp_build_clamp(coord_bld
, coord
, min
, max
);
697 icoord
= lp_build_ifloor(coord_bld
, coord
);
710 * Sample 2D texture with nearest filtering.
713 lp_build_sample_2d_nearest_soa(struct lp_build_sample_context
*bld
,
719 LLVMValueRef data_ptr
,
724 x
= lp_build_sample_wrap_nearest(bld
, s
, width
,
725 bld
->static_state
->pot_width
,
726 bld
->static_state
->wrap_s
);
727 y
= lp_build_sample_wrap_nearest(bld
, t
, height
,
728 bld
->static_state
->pot_height
,
729 bld
->static_state
->wrap_t
);
731 lp_build_name(x
, "tex.x.wrapped");
732 lp_build_name(y
, "tex.y.wrapped");
734 lp_build_sample_texel_soa(bld
, width
, height
, x
, y
, stride
, data_ptr
, texel
);
739 * Sample 2D texture with bilinear filtering.
742 lp_build_sample_2d_linear_soa(struct lp_build_sample_context
*bld
,
748 LLVMValueRef data_ptr
,
751 LLVMValueRef s_fpart
;
752 LLVMValueRef t_fpart
;
755 LLVMValueRef neighbors
[2][2][4];
758 lp_build_sample_wrap_linear(bld
, s
, width
, bld
->static_state
->pot_width
,
759 bld
->static_state
->wrap_s
, &x0
, &x1
, &s_fpart
);
760 lp_build_sample_wrap_linear(bld
, t
, height
, bld
->static_state
->pot_height
,
761 bld
->static_state
->wrap_t
, &y0
, &y1
, &t_fpart
);
763 lp_build_sample_texel_soa(bld
, width
, height
, x0
, y0
, stride
, data_ptr
, neighbors
[0][0]);
764 lp_build_sample_texel_soa(bld
, width
, height
, x1
, y0
, stride
, data_ptr
, neighbors
[0][1]);
765 lp_build_sample_texel_soa(bld
, width
, height
, x0
, y1
, stride
, data_ptr
, neighbors
[1][0]);
766 lp_build_sample_texel_soa(bld
, width
, height
, x1
, y1
, stride
, data_ptr
, neighbors
[1][1]);
768 /* TODO: Don't interpolate missing channels */
769 for(chan
= 0; chan
< 4; ++chan
) {
770 texel
[chan
] = lp_build_lerp_2d(&bld
->texel_bld
,
772 neighbors
[0][0][chan
],
773 neighbors
[0][1][chan
],
774 neighbors
[1][0][chan
],
775 neighbors
[1][1][chan
]);
781 lp_build_rgba8_to_f32_soa(LLVMBuilderRef builder
,
782 struct lp_type dst_type
,
786 LLVMValueRef mask
= lp_build_int_const_scalar(dst_type
, 0xff);
789 /* Decode the input vector components */
790 for (chan
= 0; chan
< 4; ++chan
) {
791 unsigned start
= chan
*8;
792 unsigned stop
= start
+ 8;
798 input
= LLVMBuildLShr(builder
, input
, lp_build_int_const_scalar(dst_type
, start
), "");
801 input
= LLVMBuildAnd(builder
, input
, mask
, "");
803 input
= lp_build_unsigned_norm_to_float(builder
, 8, dst_type
, input
);
811 lp_build_sample_2d_linear_aos(struct lp_build_sample_context
*bld
,
817 LLVMValueRef data_ptr
,
820 LLVMBuilderRef builder
= bld
->builder
;
821 struct lp_build_context i32
, h16
, u8n
;
822 LLVMTypeRef i32_vec_type
, h16_vec_type
, u8n_vec_type
;
823 LLVMValueRef i32_c8
, i32_c128
, i32_c255
;
824 LLVMValueRef s_ipart
, s_fpart
, s_fpart_lo
, s_fpart_hi
;
825 LLVMValueRef t_ipart
, t_fpart
, t_fpart_lo
, t_fpart_hi
;
828 LLVMValueRef neighbors
[2][2];
829 LLVMValueRef neighbors_lo
[2][2];
830 LLVMValueRef neighbors_hi
[2][2];
831 LLVMValueRef packed
, packed_lo
, packed_hi
;
832 LLVMValueRef unswizzled
[4];
834 lp_build_context_init(&i32
, builder
, lp_type_int(32));
835 lp_build_context_init(&h16
, builder
, lp_type_ufixed(16));
836 lp_build_context_init(&u8n
, builder
, lp_type_unorm(8));
838 i32_vec_type
= lp_build_vec_type(i32
.type
);
839 h16_vec_type
= lp_build_vec_type(h16
.type
);
840 u8n_vec_type
= lp_build_vec_type(u8n
.type
);
842 if (bld
->static_state
->normalized_coords
) {
843 LLVMTypeRef coord_vec_type
= lp_build_vec_type(bld
->coord_type
);
844 LLVMValueRef fp_width
= LLVMBuildSIToFP(bld
->builder
, width
, coord_vec_type
, "");
845 LLVMValueRef fp_height
= LLVMBuildSIToFP(bld
->builder
, height
, coord_vec_type
, "");
846 s
= lp_build_mul(&bld
->coord_bld
, s
, fp_width
);
847 t
= lp_build_mul(&bld
->coord_bld
, t
, fp_height
);
850 /* scale coords by 256 (8 fractional bits) */
851 s
= lp_build_mul_imm(&bld
->coord_bld
, s
, 256);
852 t
= lp_build_mul_imm(&bld
->coord_bld
, t
, 256);
854 /* convert float to int */
855 s
= LLVMBuildFPToSI(builder
, s
, i32_vec_type
, "");
856 t
= LLVMBuildFPToSI(builder
, t
, i32_vec_type
, "");
858 /* subtract 0.5 (add -128) */
859 i32_c128
= lp_build_int_const_scalar(i32
.type
, -128);
860 s
= LLVMBuildAdd(builder
, s
, i32_c128
, "");
861 t
= LLVMBuildAdd(builder
, t
, i32_c128
, "");
863 /* compute floor (shift right 8) */
864 i32_c8
= lp_build_int_const_scalar(i32
.type
, 8);
865 s_ipart
= LLVMBuildAShr(builder
, s
, i32_c8
, "");
866 t_ipart
= LLVMBuildAShr(builder
, t
, i32_c8
, "");
868 /* compute fractional part (AND with 0xff) */
869 i32_c255
= lp_build_int_const_scalar(i32
.type
, 255);
870 s_fpart
= LLVMBuildAnd(builder
, s
, i32_c255
, "");
871 t_fpart
= LLVMBuildAnd(builder
, t
, i32_c255
, "");
876 x1
= lp_build_add(&bld
->int_coord_bld
, x0
, bld
->int_coord_bld
.one
);
877 y1
= lp_build_add(&bld
->int_coord_bld
, y0
, bld
->int_coord_bld
.one
);
879 x0
= lp_build_sample_wrap_int(bld
, x0
, width
, bld
->static_state
->pot_width
,
880 bld
->static_state
->wrap_s
);
881 y0
= lp_build_sample_wrap_int(bld
, y0
, height
, bld
->static_state
->pot_height
,
882 bld
->static_state
->wrap_t
);
884 x1
= lp_build_sample_wrap_int(bld
, x1
, width
, bld
->static_state
->pot_width
,
885 bld
->static_state
->wrap_s
);
886 y1
= lp_build_sample_wrap_int(bld
, y1
, height
, bld
->static_state
->pot_height
,
887 bld
->static_state
->wrap_t
);
890 * Transform 4 x i32 in
892 * s_fpart = {s0, s1, s2, s3}
896 * s_fpart = {00, s0, 00, s1, 00, s2, 00, s3}
900 * s_fpart_lo = {s0, s0, s0, s0, s1, s1, s1, s1}
901 * s_fpart_hi = {s2, s2, s2, s2, s3, s3, s3, s3}
903 * and likewise for t_fpart. There is no risk of loosing precision here
904 * since the fractional parts only use the lower 8bits.
907 s_fpart
= LLVMBuildBitCast(builder
, s_fpart
, h16_vec_type
, "");
908 t_fpart
= LLVMBuildBitCast(builder
, t_fpart
, h16_vec_type
, "");
911 LLVMTypeRef elem_type
= LLVMInt32Type();
912 LLVMValueRef shuffles_lo
[LP_MAX_VECTOR_LENGTH
];
913 LLVMValueRef shuffles_hi
[LP_MAX_VECTOR_LENGTH
];
914 LLVMValueRef shuffle_lo
;
915 LLVMValueRef shuffle_hi
;
918 for(j
= 0; j
< h16
.type
.length
; j
+= 4) {
919 unsigned subindex
= util_cpu_caps
.little_endian
? 0 : 1;
922 index
= LLVMConstInt(elem_type
, j
/2 + subindex
, 0);
923 for(i
= 0; i
< 4; ++i
)
924 shuffles_lo
[j
+ i
] = index
;
926 index
= LLVMConstInt(elem_type
, h16
.type
.length
/2 + j
/2 + subindex
, 0);
927 for(i
= 0; i
< 4; ++i
)
928 shuffles_hi
[j
+ i
] = index
;
931 shuffle_lo
= LLVMConstVector(shuffles_lo
, h16
.type
.length
);
932 shuffle_hi
= LLVMConstVector(shuffles_hi
, h16
.type
.length
);
934 s_fpart_lo
= LLVMBuildShuffleVector(builder
, s_fpart
, h16
.undef
, shuffle_lo
, "");
935 t_fpart_lo
= LLVMBuildShuffleVector(builder
, t_fpart
, h16
.undef
, shuffle_lo
, "");
936 s_fpart_hi
= LLVMBuildShuffleVector(builder
, s_fpart
, h16
.undef
, shuffle_hi
, "");
937 t_fpart_hi
= LLVMBuildShuffleVector(builder
, t_fpart
, h16
.undef
, shuffle_hi
, "");
941 * Fetch the pixels as 4 x 32bit (rgba order might differ):
943 * rgba0 rgba1 rgba2 rgba3
945 * bit cast them into 16 x u8
947 * r0 g0 b0 a0 r1 g1 b1 a1 r2 g2 b2 a2 r3 g3 b3 a3
949 * unpack them into two 8 x i16:
951 * r0 g0 b0 a0 r1 g1 b1 a1
952 * r2 g2 b2 a2 r3 g3 b3 a3
954 * The higher 8 bits of the resulting elements will be zero.
957 neighbors
[0][0] = lp_build_sample_packed(bld
, x0
, y0
, stride
, data_ptr
);
958 neighbors
[0][1] = lp_build_sample_packed(bld
, x1
, y0
, stride
, data_ptr
);
959 neighbors
[1][0] = lp_build_sample_packed(bld
, x0
, y1
, stride
, data_ptr
);
960 neighbors
[1][1] = lp_build_sample_packed(bld
, x1
, y1
, stride
, data_ptr
);
962 neighbors
[0][0] = LLVMBuildBitCast(builder
, neighbors
[0][0], u8n_vec_type
, "");
963 neighbors
[0][1] = LLVMBuildBitCast(builder
, neighbors
[0][1], u8n_vec_type
, "");
964 neighbors
[1][0] = LLVMBuildBitCast(builder
, neighbors
[1][0], u8n_vec_type
, "");
965 neighbors
[1][1] = LLVMBuildBitCast(builder
, neighbors
[1][1], u8n_vec_type
, "");
967 lp_build_unpack2(builder
, u8n
.type
, h16
.type
, neighbors
[0][0], &neighbors_lo
[0][0], &neighbors_hi
[0][0]);
968 lp_build_unpack2(builder
, u8n
.type
, h16
.type
, neighbors
[0][1], &neighbors_lo
[0][1], &neighbors_hi
[0][1]);
969 lp_build_unpack2(builder
, u8n
.type
, h16
.type
, neighbors
[1][0], &neighbors_lo
[1][0], &neighbors_hi
[1][0]);
970 lp_build_unpack2(builder
, u8n
.type
, h16
.type
, neighbors
[1][1], &neighbors_lo
[1][1], &neighbors_hi
[1][1]);
973 * Linear interpolate with 8.8 fixed point.
976 packed_lo
= lp_build_lerp_2d(&h16
,
977 s_fpart_lo
, t_fpart_lo
,
983 packed_hi
= lp_build_lerp_2d(&h16
,
984 s_fpart_hi
, t_fpart_hi
,
990 packed
= lp_build_pack2(builder
, h16
.type
, u8n
.type
, packed_lo
, packed_hi
);
993 * Convert to SoA and swizzle.
996 packed
= LLVMBuildBitCast(builder
, packed
, i32_vec_type
, "");
998 lp_build_rgba8_to_f32_soa(bld
->builder
,
1000 packed
, unswizzled
);
1002 lp_build_format_swizzle_soa(bld
->format_desc
,
1003 bld
->texel_type
, unswizzled
,
1009 lp_build_sample_compare(struct lp_build_sample_context
*bld
,
1011 LLVMValueRef
*texel
)
1013 struct lp_build_context
*texel_bld
= &bld
->texel_bld
;
1017 if(bld
->static_state
->compare_mode
== PIPE_TEX_COMPARE_NONE
)
1020 /* TODO: Compare before swizzling, to avoid redundant computations */
1022 for(chan
= 0; chan
< 4; ++chan
) {
1024 cmp
= lp_build_cmp(texel_bld
, bld
->static_state
->compare_func
, p
, texel
[chan
]);
1025 cmp
= lp_build_select(texel_bld
, cmp
, texel_bld
->one
, texel_bld
->zero
);
1028 res
= lp_build_add(texel_bld
, res
, cmp
);
1034 res
= lp_build_mul(texel_bld
, res
, lp_build_const_scalar(texel_bld
->type
, 0.25));
1036 /* XXX returning result for default GL_DEPTH_TEXTURE_MODE = GL_LUMINANCE */
1037 for(chan
= 0; chan
< 3; ++chan
)
1039 texel
[3] = texel_bld
->one
;
1044 texture_dims(enum pipe_texture_target tex
)
1047 case PIPE_TEXTURE_1D
:
1049 case PIPE_TEXTURE_2D
:
1050 case PIPE_TEXTURE_CUBE
:
1052 case PIPE_TEXTURE_3D
:
1055 assert(0 && "bad texture target in texture_dims()");
1062 * Generate code to compute texture level of detail (lambda).
1063 * \param s vector of texcoord s values
1064 * \param t vector of texcoord t values
1065 * \param r vector of texcoord r values
1066 * \param width scalar int texture width
1067 * \param height scalar int texture height
1068 * \param depth scalar int texture depth
1071 lp_build_lod_selector(struct lp_build_sample_context
*bld
,
1076 LLVMValueRef height
,
1080 const int dims
= texture_dims(bld
->static_state
->target
);
1081 struct lp_build_context
*coord_bld
= &bld
->coord_bld
;
1083 LLVMValueRef lod_bias
= lp_build_const_scalar(bld
->coord_bld
.type
,
1084 bld
->static_state
->lod_bias
);
1085 LLVMValueRef min_lod
= lp_build_const_scalar(bld
->coord_bld
.type
,
1086 bld
->static_state
->min_lod
);
1087 LLVMValueRef max_lod
= lp_build_const_scalar(bld
->coord_bld
.type
,
1088 bld
->static_state
->max_lod
);
1090 LLVMValueRef index0
= LLVMConstInt(LLVMInt32Type(), 0, 0);
1091 LLVMValueRef index1
= LLVMConstInt(LLVMInt32Type(), 1, 0);
1092 LLVMValueRef index2
= LLVMConstInt(LLVMInt32Type(), 2, 0);
1094 LLVMValueRef s0
, s1
, s2
;
1095 LLVMValueRef t0
, t1
, t2
;
1096 LLVMValueRef r0
, r1
, r2
;
1097 LLVMValueRef dsdx
, dsdy
, dtdx
, dtdy
, drdx
, drdy
;
1098 LLVMValueRef rho
, lod
;
1101 * dsdx = abs(s[1] - s[0]);
1102 * dsdy = abs(s[2] - s[0]);
1103 * dtdx = abs(t[1] - t[0]);
1104 * dtdy = abs(t[2] - t[0]);
1105 * drdx = abs(r[1] - r[0]);
1106 * drdy = abs(r[2] - r[0]);
1107 * XXX we're assuming a four-element quad in 2x2 layout here.
1109 s0
= LLVMBuildExtractElement(bld
->builder
, s
, index0
, "s0");
1110 s1
= LLVMBuildExtractElement(bld
->builder
, s
, index1
, "s1");
1111 s2
= LLVMBuildExtractElement(bld
->builder
, s
, index2
, "s2");
1112 dsdx
= lp_build_abs(coord_bld
, lp_build_sub(coord_bld
, s1
, s0
));
1113 dsdy
= lp_build_abs(coord_bld
, lp_build_sub(coord_bld
, s2
, s0
));
1115 t0
= LLVMBuildExtractElement(bld
->builder
, t
, index0
, "t0");
1116 t1
= LLVMBuildExtractElement(bld
->builder
, t
, index1
, "t1");
1117 t2
= LLVMBuildExtractElement(bld
->builder
, t
, index2
, "t2");
1118 dtdx
= lp_build_abs(coord_bld
, lp_build_sub(coord_bld
, t1
, t0
));
1119 dtdy
= lp_build_abs(coord_bld
, lp_build_sub(coord_bld
, t2
, t0
));
1121 r0
= LLVMBuildExtractElement(bld
->builder
, r
, index0
, "r0");
1122 r1
= LLVMBuildExtractElement(bld
->builder
, r
, index1
, "r1");
1123 r2
= LLVMBuildExtractElement(bld
->builder
, r
, index2
, "r2");
1124 drdx
= lp_build_abs(coord_bld
, lp_build_sub(coord_bld
, r1
, r0
));
1125 drdy
= lp_build_abs(coord_bld
, lp_build_sub(coord_bld
, r2
, r0
));
1129 /* Compute rho = max of all partial derivatives scaled by texture size.
1130 * XXX this can be vectorized somewhat
1132 rho
= lp_build_mul(coord_bld
,
1133 lp_build_max(coord_bld
, dsdx
, dsdy
),
1134 lp_build_int_to_float(coord_bld
, width
));
1137 max
= lp_build_mul(coord_bld
,
1138 lp_build_max(coord_bld
, dtdx
, dtdy
),
1139 lp_build_int_to_float(coord_bld
, height
));
1140 rho
= lp_build_max(coord_bld
, rho
, max
);
1142 max
= lp_build_mul(coord_bld
,
1143 lp_build_max(coord_bld
, drdx
, drdy
),
1144 lp_build_int_to_float(coord_bld
, depth
));
1145 rho
= lp_build_max(coord_bld
, rho
, max
);
1149 /* compute lod = log2(rho) */
1150 lod
= lp_build_log2(coord_bld
, rho
);
1153 lod
= lp_build_add(coord_bld
, lod
, lod_bias
);
1156 lod
= lp_build_clamp(coord_bld
, lod
, min_lod
, max_lod
);
1165 * Build texture sampling code.
1166 * 'texel' will return a vector of four LLVMValueRefs corresponding to
1170 lp_build_sample_soa(LLVMBuilderRef builder
,
1171 const struct lp_sampler_static_state
*static_state
,
1172 struct lp_sampler_dynamic_state
*dynamic_state
,
1173 struct lp_type type
,
1175 unsigned num_coords
,
1176 const LLVMValueRef
*coords
,
1177 LLVMValueRef lodbias
,
1178 LLVMValueRef
*texel
)
1180 struct lp_build_sample_context bld
;
1182 LLVMValueRef height
;
1183 LLVMValueRef stride
;
1184 LLVMValueRef data_ptr
;
1189 (void) lp_build_lod_selector
; /* temporary to silence warning */
1191 /* Setup our build context */
1192 memset(&bld
, 0, sizeof bld
);
1193 bld
.builder
= builder
;
1194 bld
.static_state
= static_state
;
1195 bld
.dynamic_state
= dynamic_state
;
1196 bld
.format_desc
= util_format_description(static_state
->format
);
1197 bld
.coord_type
= type
;
1198 bld
.uint_coord_type
= lp_uint_type(type
);
1199 bld
.int_coord_type
= lp_int_type(type
);
1200 bld
.texel_type
= type
;
1201 lp_build_context_init(&bld
.coord_bld
, builder
, bld
.coord_type
);
1202 lp_build_context_init(&bld
.uint_coord_bld
, builder
, bld
.uint_coord_type
);
1203 lp_build_context_init(&bld
.int_coord_bld
, builder
, bld
.int_coord_type
);
1204 lp_build_context_init(&bld
.texel_bld
, builder
, bld
.texel_type
);
1206 /* Get the dynamic state */
1207 width
= dynamic_state
->width(dynamic_state
, builder
, unit
);
1208 height
= dynamic_state
->height(dynamic_state
, builder
, unit
);
1209 stride
= dynamic_state
->stride(dynamic_state
, builder
, unit
);
1210 data_ptr
= dynamic_state
->data_ptr(dynamic_state
, builder
, unit
);
1216 width
= lp_build_broadcast_scalar(&bld
.uint_coord_bld
, width
);
1217 height
= lp_build_broadcast_scalar(&bld
.uint_coord_bld
, height
);
1218 stride
= lp_build_broadcast_scalar(&bld
.uint_coord_bld
, stride
);
1220 if(static_state
->target
== PIPE_TEXTURE_1D
)
1221 t
= bld
.coord_bld
.zero
;
1223 switch (static_state
->min_img_filter
) {
1224 case PIPE_TEX_FILTER_NEAREST
:
1225 lp_build_sample_2d_nearest_soa(&bld
, s
, t
, width
, height
,
1226 stride
, data_ptr
, texel
);
1228 case PIPE_TEX_FILTER_LINEAR
:
1229 if(lp_format_is_rgba8(bld
.format_desc
) &&
1230 is_simple_wrap_mode(static_state
->wrap_s
) &&
1231 is_simple_wrap_mode(static_state
->wrap_t
))
1232 lp_build_sample_2d_linear_aos(&bld
, s
, t
, width
, height
,
1233 stride
, data_ptr
, texel
);
1235 lp_build_sample_2d_linear_soa(&bld
, s
, t
, width
, height
,
1236 stride
, data_ptr
, texel
);
1242 /* FIXME: respect static_state->min_mip_filter */;
1243 /* FIXME: respect static_state->mag_img_filter */;
1245 lp_build_sample_compare(&bld
, r
, texel
);